Gas Physical Properties (2022)

Acetylene
Formula C₂H₂
Molecular Weight (lb/mol) 26.04
Critical Temp. (°F) 96.0
Critical Pressure (psia) 906.0
Boiling Point (°F) –119.6
Melting Point (°F) –113.4
Psat @ 70°F (psia) 586.2
Liquid Density @ 70°F (lb/ft³) 23.61
Gas Density @ 70°F 1 atm (lb/ft³) 0.0677
Specific Volume @ 70°F 1 atm (ft³/lb) 14.76
Specific Gravity 0.920
Specific Heat @ 70°F (Btu/lbmol–°F) 10.53
Air
Formula --
Molecular Weight (lb/mol) 28.96
Critical Temp. (°F) N/A
Critical Pressure (psia) N/A
Boiling Point (°F) –317.8
Melting Point (°F) N/A
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.075
Specific Volume @ 70°F 1 atm (ft³/lb) 13.3
Specific Gravity 1.000
Specific Heat @ 70°F (Btu/lbmol–°F) 6.96

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Ammonia
Formula NH₃
Molecular Weight (lb/mol) 17.03
Critical Temp. (°F) 270.1
Critical Pressure (psia) 1636.0
Boiling Point (°F) -28.2
Melting Point (°F) –107.9
Psat @ 70°F (psia) 129.0
Liquid Density @ 70°F (lb/ft³) 38.55
Gas Density @ 70°F 1 atm (lb/ft³) 0.0445
Specific Volume @ 70°F 1 atm (ft³/lb) 22.48
Specific Gravity 0.604
Specific Heat @ 70°F (Btu/lbmol–°F) 8.69
Argon
Formula Ar
Molecular Weight (lb/mol) 39.95
Critical Temp. (°F) –188.4
Critical Pressure (psia) 705.8
Boiling Point (°F) –302.6
Melting Point (°F) –308.8
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.1034
Specific Volume @ 70°F 1 atm (ft³/lb) 9.67
Specific Gravity 1.38
Specific Heat @ 70°F (Btu/lbmol–°F) 4.98

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Arsine
Formula AsH₃
Molecular Weight (lb/mol) 77.95
Critical Temp. (°F) 211.8
Critical Pressure (psia) 957
Boiling Point (°F) –79.9
Melting Point (°F) –178.5
Psat @ 70°F (psia) 217.9
Liquid Density @ 70°F (lb/ft³) 92.59
Gas&nbsp Density @ 70°F 1 atm (lb/ft³) 0.2038
Specific Volume @ 70°F 1 atm (ft³/lb) 4.91
Specific Gravity 2.769
Specific Heat @ 70°F (Btu/lbmol–°F) 9.23
Boron Trichloride
Formula BCl₃
Molecular Weight (lb/mol) 117.17
Critical Temp. (°F) 353.8
Critical Pressure (psia) 561.3
Boiling Point (°F) 54.6
Melting Point (°F) –160.6
Psat @ 70°F (psia) 19.9
Liquid Density @ 70°F (lb/ft³) 84.44
Gas Density @ 70°F 1 atm (lb/ft³) 0.3141
Specific Volume @ 70°F 1 atm (ft³/lb) 3.18
Specific Gravity 4.267
Specific Heat @ 70°F (Btu/lbmol–°F) 15.11
Boron Trifluoride
Formula BF₃
Molecular Weight (lb/mol) 67.81
Critical Temp. (°F) 10.0
Critical Pressure (psia) 723.0
Boiling Point (°F) –148.5
Melting Point (°F) –199.7
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.1745
Specific Volume @ 70°F 1 atm (ft³/lb) 5.73
Specific Gravity 2.320
Specific Heat @ 70°F (Btu/lbmol–°F) 12.10

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Butane
Formula C₄H₁₀
Molecular Weight (lb/mol) 58.12
Critical Temp. (°F) 305.9
Critical Pressure (psia) 549.9
Boiling Point (°F) 31.0
Melting Point (°F) —217.0
Psat @ 70°F (psia) 31.3
Liquid Density @ 70°F (lb/ft³) 36.05
Gas Density @ 70°F 1 atm (lb/ft³) 0.1551
Specific Volume @ 70°F 1 atm (ft³/lb) 6.45
Specific Gravity 2.108
Specific Heat @ 70°F (Btu/lbmol—°F) 23.87
Carbon Dioxide
Formula CO₂
Molecular Weight (lb/mol) 44.01
Critical Temp. (°F) 87.9
Critical Pressure (psia) 1071.0
Boiling Point (°F) –109.2
Melting Point (°F) –69.9
Psat @ 70°F (psia) 852.8
Liquid Density @ 70°F (lb/ft³) 47.64
Gas Density @ 70°F 1 atm (lb/ft³) 0.1144
Specific Volume @ 70°F 1 atm (ft³/lb) 8.74
Specific Gravity 1.555
Specific Heat @ 70°F (Btu/lbmol–°F) 8.92
Carbon Monoxide
Formula CO
Molecular Weight (lb/mol) 28.01
Critical Temp. (°F) –220.4
Critical Pressure (psia) 485.6
Boiling Point (°F) –312.7
Melting Point (°F) –337.1
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0725
Specific Volume @ 70°F 1 atm (ft³/lb) 13.80
Specific Gravity 0.985
Specific Heat @ 70°F (Btu/lbmol–°F) 6.97

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

(Video) Properties of Gases

Chlorine
Formula Cl₂
Molecular Weight (lb/mol) 70.91
Critical Temp. (°F) 291.2
Critical Pressure (psia) 1118.4
Boiling Point (°F) –29.3
Melting Point (°F) –149.8
Psat @ 70°F (psia) 98.4
Liquid Density @ 70°F (lb/ft³) 88.83
Gas Density @ 70°F 1 atm (lb/ft³) 0.1858
Specific Volume @ 70°F 1 atm (ft³/lb) 5.38
Specific Gravity 2.524
Specific Heat @ 70°F (Btu/lbmol–°F) 8.16
Deuterium
Formula D₂
Molecular Weight (lb/mol) 4.03
Critical Temp. (°F) –390.8
Critical Pressure (psia) 241.5
Boiling Point (°F) –417.0
Melting Point (°F) –426.0
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0104
Specific Volume @ 70°F 1 atm (ft³/lb) 95.97
Specific Gravity 0.142
Specific Heat @ 70°F (Btu/lbmol–°F) 6.95

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Diborane
Formula B₂H₆
Molecular Weight (lb/mol) 27.67
Critical Temp. (°F) 62.1
Critical Pressure (psia) 580.8
Boiling Point (°F) –135.1
Melting Point (°F) –264.8
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0712
Specific Volume @ 70°F 1 atm (ft³/lb) 14.05
Specific Gravity 0.950
Specific Heat @ 70°F (Btu/lbmol–°F) 13.67

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Dichlorosilane
Formula SiH₂Cl₂
Molecular Weight (lb/mol) 101.01
Critical Temp. (°F) 348.8
Critical Pressure (psia) 678.2
Boiling Point (°F) 49.9
Melting Point (°F) –187.6
Psat @ 70°F (psia) 24.2
Liquid Density @ 70°F (lb/ft³) 75.19
Gas Density @ 70°F 1 atm (lb/ft³) 0.2602
Specific Volume @ 70°F 1 atm (ft³/lb) 3.84
Specific Gravity 3.470
Specific Heat @ 70°F (Btu/lbmol–°F) 14.74
Disilane
Formula Si₂H₆
Molecular Weight (lb/mol) 62.22
Critical Temp. (°F) 303.5
Critical Pressure (psia) 746.9
Boiling Point (°F) 6.3
Melting Point (°F) –206.7
Psat @ 70°F (psia) 49.3
Liquid Density @ 70°F (lb/ft³) N/A
Gas Density @ 70°F 1 atm (lb/ft³) N/A
Specific Volume @ 70°F 1 atm (ft³/lb) N/A
Specific Gravity N/A
Specific Heat @ 70°F (Btu/lbmol–°F) N/A
Ethane
Formula C₂H₆
Molecular Weight (lb/mol) 30.07
Critical Temp. (°F) 90.4
Critical Pressure (psia) 707.9
Boiling Point (°F) –127.5
Melting Point (°F) –297.9
Psat @ 70°F (psia) 559.6
Liquid Density @ 70°F (lb/ft³) 20.98
Gas Density @ 70°F 1 atm (lb/ft³) 0.0784
Specific Volume @ 70°F 1 atm (ft³/lb) 12.76
Specific Gravity 1.065
Specific Heat @ 70°F (Btu/lbmol–°F) 12.67
Ethyl Chloride
Formula C₂H₅Cl
Molecular Weight (lb/mol) 64.52
Critical Temp. (°F) 369.0
Critical Pressure (psia) 764.2
Boiling Point (°F) 54.0
Melting Point (°F) –217.0
Psat @ 70°F (psia) 20.3
Liquid Density @ 70°F (lb/ft³) 55.78
Gas Density @ 70°F 1 atm (lb/ft³) 0.1720
Specific Volume @ 70°F 1 atm (ft³/lb) 5.82
Specific Gravity 2.336
Specific Heat @ 70°F (Btu/lbmol–°F) 15.41
Ethylene
Formula C₂H₄
Molecular Weight (lb/mol) 28.05
Critical Temp. (°F) 49.1
Critical Pressure (psia) 742.7
Boiling Point (°F) –154.8
Melting Point (°F) –272.5
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0730
Specific Volume @ 70°F 1 atm (ft³/lb) 13.70
Specific Gravity 0.992
Specific Heat @ 70°F (Btu/lbmol–°F) 10.28

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Fluorine
Formula F₂
Molecular Weight (lb/mol) 38.00
Critical Temp. (°F) –199.9
Critical Pressure (psia) 754.6
Boiling Point (°F) –306.8
Melting Point (°F) –363.4
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0983
Specific Volume @ 70°F 1 atm (ft³/lb) 10.17
Specific Gravity 1.336
Specific Heat @ 70°F (Btu/lbmol–°F) 7.49

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Halocarbon-116
Formula C2F6
Molecular Weight (lb/mol) 138.01
Critical Temp. (°F) 67.5
Critical Pressure (psia) 432.2
Boiling Point (°F) -108.7
Melting Point (°F) -149.3
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft3) (note 1)
Gas Density @ 70°F 1 atm (lb/ft3) 0.3616
Specific Volume @ 70°F 1 atm (ft3/lb) 2.77
Specific Gravity 4.913
Specific Heat @ 70°F (Btu/lbmol-°F) 25.25

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

(Video) Properties of Gases | Short Animation | TURN ON SUBTITLES (CC)

Halocarbon-23
Formula CHF₃
Molecular Weight (lb/mol) 70.01
Critical Temp. (°F) 78.7
Critical Pressure (psia) 701.4
Boiling Point (°F) –115.5
Melting Point (°F) –247.3
Psat @ 70°F (psia) 626.0
Liquid Density @ 70°F (lb/ft³) 48.67
Gas Density @ 70°F 1 atm (lb/ft³) 0.1827
Specific Volume @ 70°F 1 atm (ft³/lb) 5.47
Specific Gravity 2.482
Specific Heat @ 70°F (Btu/lbmol–°F) 12.25
Helium
Formula He
Molecular Weight (lb/mol) 4.00
Critical Temp. (°F) –450.3
Critical Pressure (psia) 33.0
Boiling Point (°F) –452.1
Melting Point (°F) --
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0103
Specific Volume @ 70°F 1 atm (ft³/lb) 96.65
Specific Gravity 0.138
Specific Heat @ 70°F (Btu/lbmol–°F) 4.97

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Hydrogen
Formula H₂
Molecular Weight (lb/mol) 2.02
Critical Temp. (°F) –400.0
Critical Pressure (psia) 187.5
Boiling Point (°F) –423.0
Melting Point (°F) –434.5
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0052
Specific Volume @ 70°F 1 atm (ft³/lb) 191.90
Specific Gravity 0.069
Specific Heat @ 70°F (Btu/lbmol–°F) 6.87

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Hydrogen Chloride
Formula HCl
Molecular Weight (lb/mol) 36.46
Critical Temp. (°F) 124.5
Critical Pressure (psia) 1199.2
Boiling Point (°F) –120.8
Melting Point (°F) –173.6
Psat @ 70°F (psia) 629.1
Liquid Density @ 70°F (lb/ft³) 51.28
Gas Density @ 70°F 1 atm (lb/ft³) 0.0948
Specific Volume @ 70°F 1 atm (ft³/lb) 10.54
Specific Gravity 1.289
Specific Heat @ 70°F (Btu/lbmol–°F) 7.29
Hydrogen Fluoride
Formula HF
Molecular Weight (lb/mol) 20.01
Critical Temp. (°F) 370.4
Critical Pressure (psia) 940.5
Boiling Point (°F) 67.14
Melting Point (°F) –118.4
Psat @ 70°F (psia) 15.54
Liquid Density @ 70°F (lb/ft³) 60.26
Gas Density @ 70°F 1 atm (lb/ft³) (note 2)
Specific Volume @ 70°F 1 atm (ft³/lb) (note 2)
Specific Gravity (note 2)
Specific Heat @ 70°F (Btu/lbmol–°F) (note 2)

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Hydrogen Sulfide
Formula H₂S
Molecular Weight (lb/mol) 34.08
Critical Temp. (°F) 212.8
Critical Pressure (psia) 1306.5
Boiling Point (°F) –74.9
Melting Point (°F) –122.0
Psat @ 70°F (psia) 263.6
Liquid Density @ 70°F (lb/ft³) 48.52
Gas Density @ 70°F 1 atm (lb/ft³) 0.0888
Specific Volume @ 70°F 1 atm (ft³/lb) 11.26
Specific Gravity 1.207
Specific Heat @ 70°F (Btu/lbmol–°F) 8.29
Krypton
Formula Kr
Molecular Weight (lb/mol) 83.80
Critical Temp. (°F) –82.8
Critical Pressure (psia) 798.0
Boiling Point (°F) –244.1
Melting Point (°F) –251.3
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.2172
Specific Volume @ 70°F 1 atm (ft³/lb) 4.60
Specific Gravity 2.951
Specific Heat @ 70°F (Btu/lbmol–°F) 4.99

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Methane
Formula CH₄
Molecular Weight (lb/mol) 16.04
Critical Temp. (°F) –116.2
Critical Pressure (psia) 673.0
Boiling Point (°F) –258.7
Melting Point (°F) –296.5
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0416
Specific Volume @ 70°F 1 atm (ft³/lb) 24.06
Specific Gravity 0.565
Specific Heat @ 70°F (Btu/lbmol–°F) 8.53

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

(Video) Gas Law Problems Combined & Ideal - Density, Molar Mass, Mole Fraction, Partial Pressure, Effusion

Neon
Formula Ne
Molecular Weight (lb/mol) 20.18
Critical Temp. (°F) –379.8
Critical Pressure (psia) 384.9
Boiling Point (°F) –410.9
Melting Point (°F) –415.5
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0522
Specific Volume @ 70°F 1 atm (ft³/lb) 19.17
Specific Gravity 0.709
Specific Heat @ 70°F (Btu/lbmol–°F) 4.97

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Nitrogen
Formula N₂
Molecular Weight (lb/mol) 28.01
Critical Temp. (°F) –232.5
Critical Pressure (psia) 492.3
Boiling Point (°F) –320.5
Melting Point (°F) –345.9
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0725
Specific Volume @ 70°F 1 atm (ft³/lb) 13.80
Specific Gravity 0.967
Specific Heat @ 70°F (Btu/lbmol–°F) 6.97

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Nitrogen Trifluoride
Formula NF₃
Molecular Weight (lb/mol) 71.00
Critical Temp. (°F) –38.5
Critical Pressure (psia) 646.9
Boiling Point (°F) –200.2
Melting Point (°F) –340.2
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.1842
Specific Volume @ 70°F 1 atm (ft³/lb) 5.43
Specific Gravity 2.503
Specific Heat @ 70°F (Btu/lbmol–°F) 12.66

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Nitrous Oxide
Formula N₂O
Molecular Weight (lb/mol) 44.01
Critical Temp. (°F) 97.6
Critical Pressure (psia) 1053.3
Boiling Point (°F) –128.3
Melting Point (°F) –131.6
Psat @ 70°F (psia) 751.3
Liquid Density @ 70°F (lb/ft³) 48.21
Gas Density @ 70°F 1 atm (lb/ft³) 0.1145
Specific Volume @ 70°F 1 atm (ft³/lb) 8.74
Specific Gravity 1.555
Specific Heat @ 70°F (Btu/lbmol–°F) 9.17
Octafluoropropane
Formula C₃F₈
Molecular Weight (lb/mol) 188.02
Critical Temp. (°F) 161.4
Critical Pressure (psia) 386.1
Boiling Point (°F) –34.3
Melting Point (°F) –233.8
Psat @ 70°F (psia) 112.8
Liquid Density @ 70°F (lb/ft³) 84.66
Gas Density @ 70°F 1 atm (lb/ft³) 0.4956
Specific Volume @ 70°F 1 atm (ft³/lb) 2.02
Specific Gravity 6.734
Specific Heat @ 70°F (Btu/lbmol–°F) 35.48
Oxygen
Formula O₂
Molecular Weight (lb/mol) 32.00
Critical Temp. (°F) –181.8
Critical Pressure (psia) 729.1
Boiling Point (°F) –297.3
Melting Point (°F) –361.9
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.0828
Specific Volume @ 70°F 1 atm (ft³/lb) 12.08
Specific Gravity 1.1
Specific Heat @ 70°F (Btu/lbmol–°F) 7.03

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Phosphine
Formula PH₃
Molecular Weight (lb/mol) 34.00
Critical Temp. (°F) 124.9
Critical Pressure (psia) 947.9
Boiling Point (°F) –126.0
Melting Point (°F) –208.8
Psat @ 70°F (psia) 493.2
Liquid Density @ 70°F (lb/ft³) 35.50
Gas Density @ 70°F 1 atm (lb/ft³) 0.0885
Specific Volume @ 70°F 1 atm (ft³/lb) 11.30
Specific Gravity 1.203
Specific Heat @ 70°F (Btu/lbmol–°F) 8.93
Phosphorus Pentafluoride
Formula PF₅
Molecular Weight (lb/mol) 125.97
Critical Temp. (°F) 66.1
Critical Pressure (psia) 492.3
Boiling Point (°F) –120.1
Melting Point (°F) –136.8
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.3230
Specific Volume @ 70°F 1 atm (ft³/lb) 3.10
Specific Gravity 4.310
Specific Heat @ 70°F (Btu/lbmol–°F) 20.27

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

(Video) PROPERTIES OF GASES | SCIENCE | GRADE 5 | The Study Pod

Propane
Formula C₃H₈
Molecular Weight (lb/mol) 44.10
Critical Temp. (°F) 206.6
Critical Pressure (psia) 617.6
Boiling Point (°F) –43.7
Melting Point (°F) –305.8
Psat @ 70°F (psia) 124.9
Liquid Density @ 70°F (lb/ft³) 31.12
Gas Density @ 70°F 1 atm (lb/ft³) 0.1160
Specific Volume @ 70°F 1 atm (ft³/lb) 8.62
Specific Gravity 1.576
Specific Heat @ 70°F (Btu/lbmol–°F) 17.71
Propylene
Formula C₃H₆
Molecular Weight (lb/mol) 42.08
Critical Temp. (°F) 197.5
Critical Pressure (psia) 666.3
Boiling Point (°F) –53.8
Melting Point (°F) –301.4
Psat @ 70°F (psia) 152.2
Liquid Density @ 70°F (lb/ft³) 31.92
Gas Density @ 70°F 1 atm (lb/ft³) 0.1105
Specific Volume @ 70°F 1 atm (ft³/lb) 9.05
Specific Gravity 1.501
Specific Heat @ 70°F (Btu/lbmol–°F) 15.56
Silicon Tetrachloride
Formula SiCl₄
Molecular Weight (lb/mol) 169.90
Critical Temp. (°F) 453.0
Critical Pressure (psia) 543.8
Boiling Point (°F) 136.6
Melting Point (°F) –94.0
Psat @ 70°F (psia) 4.0
Liquid Density @ 70°F (lb/ft³) 92.13
Gas Density @ 70°F 1 atm (lb/ft³) (note 2)
Specific Volume @ 70°F 1 atm (ft³/lb) (note 2)
Specific Gravity (note 2)
Specific Heat @ 70°F (Btu/lbmol–°F) (note 2)

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Silicon Tetrafluoride
Formula SiF₄
Molecular Weight (lb/mol) 104.08
Critical Temp. (°F) 6.5
Critical Pressure (psia) 539.3
Boiling Point (°F) –138.6
Melting Point (°F) –124.2
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.2711
Specific Volume @ 70°F 1 atm (ft³/lb) 3.69
Specific Gravity 3.683
Specific Heat @ 70°F (Btu/lbmol–°F) 17.50

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Sulfur Dioxide
Formula SO₂
Molecular Weight (lb/mol) 64.06
Critical Temp. (°F) 315.5
Critical Pressure (psia) 1142.0
Boiling Point (°F) 14.3
Melting Point (°F) –103.9
Psat @ 70°F (psia) 49.3
Liquid Density @ 70°F (lb/ft³) 85.98
Gas Density @ 70°F 1 atm (lb/ft³) 0.1682
Specific Volume @ 70°F 1 atm (ft³/lb) 5.94
Specific Gravity 2.285
Specific Heat @ 70°F (Btu/lbmol–°F) 9.58
Sulfur Hexafluoride
Formula SF₆
Molecular Weight (lb/mol) 146.05
Critical Temp. (°F) 114.0
Critical Pressure (psia) 545.2
Boiling Point (°F) –83
Melting Point (°F) –58.9
Psat @ 70°F (psia) 314.4
Liquid Density @ 70°F (lb/ft³) 86.25
Gas Density @ 70°F 1 atm (lb/ft³) 0.3824
Specific Volume @ 70°F 1 atm (ft³/lb) 2.61
Specific Gravity 5.196
Specific Heat @ 70°F (Btu/lbmol–°F) 22.91
Sulfur Tetrafluoride
Formula SF₄
Molecular Weight (lb/mol) 108.06
Critical Temp. (°F) 195.6
Critical Pressure (psia) --
Boiling Point (°F) –40.7
Melting Point (°F) –186
Psat @ 70°F (psia) 154.7
Liquid Density @ 70°F (lb/ft³) --
Gas Density @ 70°F 1 atm (lb/ft³) 0.278
Specific Volume @ 70°F 1 atm (ft³/lb) 3.59
Specific Gravity 3.71
Specific Heat @ 70°F (Btu/lbmol–°F) --
Tetrafluoromethane
Formula CF₄
Molecular Weight (lb/mol) 88.00
Critical Temp. (°F) –50.2
Critical Pressure (psia) 543.6
Boiling Point (°F) –198.5
Melting Point (°F) –298.5
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.2285
Specific Volume @ 70°F 1 atm (ft³/lb) 4.38
Specific Gravity 3.104
Specific Heat @ 70°F (Btu/lbmol–°F) 14.43

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

Tungsten Hexafluoride
Formula WF₆
Molecular Weight (lb/mol) 297.84
Critical Temp. (°F) 337.7
Critical Pressure (psia) 619.3
Boiling Point (°F) 62.7
Melting Point (°F) 35.6
Psat @ 70°F (psia) 17.1
Liquid Density @ 70°F (lb/ft³) 216.13
Gas Density @ 70°F 1 atm (lb/ft³) 0.7951
Specific Volume @ 70°F 1 atm (ft³/lb) 1.26
Specific Gravity 10.803
Specific Heat @ 70°F (Btu/lbmol–°F) 28.37
Xenon
Formula Xe
Molecular Weight (lb/mol) 131.3
Critical Temp. (°F) 61.9
Critical Pressure (psia) 847.1
Boiling Point (°F) –162.6
Melting Point (°F) –169.4
Psat @ 70°F (psia) (note 1)
Liquid Density @ 70°F (lb/ft³) (note 1)
Gas Density @ 70°F 1 atm (lb/ft³) 0.3414
Specific Volume @ 70°F 1 atm (ft³/lb) 2.93
Specific Gravity 4.639
Specific Heat @ 70°F (Btu/lbmol–°F) 5.02

Notes:
1 = Signifies at 70°F, the compound is above its critical temperature.
2 = Signifies that at 70°F, the compound is below the normal boiling point and only the equilibrium vapor is present at 1 atmosphere.

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